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  • Cellular Radio And Personal Communication Systems
    2,502 words
    RADIOTELEPHONE In addition to the wireline telephones described in The telephone instrument, there exist a number of wireless instruments that are connected to the public switched telephone network (PSTN). At the present time, these wireless telephones generally fall into one of three categories: cordless telephones, cellular radio systems, or personal communication systems. Eventually these systems will be expanded to include global satellite-based telephony. Cordless telephones. Cordless telep...
  • World Broadband Satellite Service Markets
    2,234 words
    In recent years the demand for high-speed networking, driven mainly by the rapid expansion of the Internet, has been growing at an exponential rate. While a wide range of wire line and wireless solutions offering broadband connectivity are or will shortly be available, communication satellites are beginning to emerge as an attractive solution in providing broadband connectivity to a variety of users. The wide area or global coverage of satellites enables service provision to a large number of di...
  • Long As Satellites Orbit The Earth
    1,036 words
    Satellites Satellite is probably the most useful invention since the wheel. Satellites have the capability to let you talk with someone across the nation or let you close a business deal through video communication. Almost everything today is heading towards the use of satellites, such as telephones. At&t has used this communications satellite (top right) ever since the late 1950's. TVS and radios are also turning to the use of satellites. RCA and Sony have released satellite dishes for Radio an...
  • Satellite Orbits The Earth
    896 words
    Satellites have been the guiding force of human space exploration for a long as space exploration has existed. The following material that is being presented is overview of satellite history and I hope all readers of this material find that it is informative and interesting. A satellite is any object that orbits a larger object. This being so makes the most famous satellite, our moon. (picture of moon from Apollo 11) Since early times humans have been fascinated with our moon, and from this we m...
  • Gps Satellites
    344 words
    GPS (Global Positioning System): is a communications network consisting of 24 satellites orbiting the Earth at an altitude of about 17600 km, it allows people to find the approximate whereabouts and coordinates of their location with GPS receivers. The satellites are in constant contact with radar communication stations on Earth. These radio communication stations inform the satellites of their exact location with respect to the Earth's surface. All the GPS satellites are equipped with precisely...
  • Satellite Communication Systems Offers Point
    530 words
    Introduction Definition: Communications Satellite is a satellite stationed in geosynchronous orbit that acts as a microwave relay station, receiving signals sent from a ground-based station (earth station), amplifying them, and retransmitting them on a different frequency to another ground-based station. Initially used for telephone and television signals, communications satellites can also be used for high-speed transmission of various multimedia services such as data communications, video and ...

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